Elastic-fluid turbine



0. JUNGGREN.

ELASTIC FLUID TURBINE.

APPLICATION FILED IIOv. III. 1919.

Inventor:

1,366,667, Patented Jan. 25, 1921.

HisAL ornes.

UNITED .sTA'rEs OSCAR J'UNGGBEN,

PATENT OFFICE.-

OF SOHENECTADY, YORK, ASSIGNOB; 530 GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELASTIC-FLUID TURBINE.

Specification of Letters Patent.

Patented Jan. 25, 1921;

' Application filed November 18, 1919. Serial Hm 338,997.

To all whom it may concern:

Be it known that I, OSCAR JUNeonnN, a citizen of the United States, residing at Schenectady, in the county of Schenectady,

State of New York, have invented certain new and useful Improvements in Elastic- Fluid Turbines, of which the following is a specification.

The present invention relates to elastic tion of a portion of a bucket wheel embody-' ing my invention and Fig. 2 is a radial sectional view thereof.

Referring to the drawing, 3 indicates the web of the wheel or rotor and 4 the rim thereof upon which the ring of buckets 5 is mounted. On opposite sides rim'& is provided with annular shoulders 6 and annular grooves 7 thereby providing an annular head 8 having undercut sides. bases are provided with slots forming two legs or furcations 9 which. straddle head 8. On their inner ends legs 9 are provided with inwardly facing projections 10 which fit into grooves 7 and engage under head 8. Shoulders 6 are provided with annular projections 11 behind which projections 12 on the extremities of legs 9 are located to prevent the legs from spreading. The buckets will be assembled on the rim in the usual manner one or more fillin slots not shown) being provided in the rim as is well understood. 14 indicates the bucket cover.

The bucket fastening means as just described forms what is termed the inverted dovetailed type of fastening and in itself is well known. It ma be taken as typical of a suitable type of astening means in connection with which my invention may be carried out.

Now, according to my invention, I fasten the turbine buckets to the wheelin groups, the buckets of each group being fastened to each other by fastening their bases together in a suitable manner such as by Welding, and their outer ends together'by means of the bucket cover. Each group may comprise a bases are illustrated as bein The bucketsuitable number of buckets, for example, from 6 to 8 or more, and the bucket cover Wlll be made in sections of such length that each section just spans one group. In Fig."

1 of the drawing, one group and a part of the group on each side thereof is shown. Such group extends from a to b and is shown 'as comprising seven buckets.

fastened together by providing them with grooves 15 on opposite sides which grooves, after the buckets have been assembled on the wheel, are filled with metal 16 as by the arc welding process so all the bucket bases of the group are rigidly united. The bucket bases The of a group may however, be united in other ways, such as by copper brazing, for eX- ample, and if found desirable, the bucket groups may be formed the buckets on the wheel.

The bucket cover, in addition to being prior to mounting fastened by tenons 17, as indicated, is also preferably welded or brazed to the bucket ends so the bucket cover will be firmly supported at all points.

With the above described arrangement wherein the buckets are attached to. .the

wheel in groups the buckets of each group being firmly united, it will be seen this there is no osslbility for any bucket to move indivi ually or yield at its base in such manner as to permit it to incline slightly, which may result in breakin of the bucket cover or of the tenons. Furt ermore, if'any individual bucket base does not fit the rim well nevertheless it cannot loosen or move since it is held by ad'acent buckets.

In accordance wit the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the apparatus shown is only illustrative and that the invention may be carried out by other means.

What I claim as new and desire to secure. by Letters Patent of the United States, is:

1. In an elastic fluid turbine, a rotor havets having bases provided with projections which engage in said grooves to fasten the buckets individually to the rim, said bucket bases being fastened to each other by fusion of metal to form groups.

- vided with a groove, buckets 2. In an elastic 'fluid turbine, a rotor havinga rim provided With a groove, buckets having bases provided With projections which enga e in said grooves'to fasten the buckets individually to the rim, and a sectional bucket cover fastened on the ends of said buckets, said bucket bases being fastoned to each other by fusion of metal to form groups.

3. i turbine rotor 'comprisin a rim proaving projections which fit into said groove to fasten the bucket to the rim, and a sectional bucket cover, characterized bythe fact that the bucket basesare united by fusion of metal to form bucket groups whereby any bucket is prevented from moving individually.

4:. A turbine rotor having the buckets fastened thereon individually by dovetailed connections characterized by the fact that the buckets are formed into groups by uniting the bases of successive series of buckets 6. In an elastic fluid turbine, a rotor having a rim and buckets having bases, said bases being fastened to the run by dovetailed connections, said buckets being arranged in groups, each group comprising a plurality of buckets having their bases 1 welded together and a bucket cover section Welded to their outer ends.

In witness whereof, I have hereunto set my hand this 17th da of November 1919.

OSC AR JUNGGREN'Q 

